0My Cart

Product was successfully added to your shopping cart.

Ronstan Series 40 BB Single Universal Head Block

Cat.No:  6252 Sup. No:  RF40100

Availability: In stock

RRP: $43.24

our price $39.95
Home Delivery Delivery Information
Shipping Rates:

Sheaves running on Acetal or Torlon® ball bearings provide high performance & low friction.

The 2-stage ball bearing system provides consistent performance over the full load range.

Captive Lock™ universal head can be fixed in either of two planes, or free to swivel as required


  • Low friction Acetal or Torlon® bearing system
  • Lightweight
  • Cheek cut-outs for easy bearing maintenance
  • Captive Lock™ universal head
  • Slotted pin shackle eliminates fouled lines


  • Sheave: 40 mm
  • Max. Rope: 10 mm
  • Max. Cable: - mm
  • Pin: 5.0 mm
  • M.W.L. 350 kg
  • B. L. 1000 kg
  • Weight: 70 g


  • Mainsheet
  • Halyard
  • Vang
  • Spinnaker control lines on off-the-beach catamarans, one design classes and sportsboats up to 8m (26ft)


  • Acetal ball bearings
  • UV stabilised Acetal sheave
  • Grade 316 stainless steel load strap and head fitting
  • Impact and UV resistant, fibre reinforced Nylon cheeks

Australia's largest marine accessories retailer. Serving boat owners since 1962. With sixteen big supermarkets and mail order departments Australia wide Whitworths Marine & Leisure offers the best service, convenient locations, a huge selection of quality products, and unbeatable prices.